I found this framed poster in a thrift store near my home outside of New Orleans. I can't find any for sale online, nor have I been able to obtain a lot of information about it. It is approximately 15" x 23" and appears to be an original poster because of the yellowing of the back of the paper and the apparent dating of the frame. There is also some masking tape on the hanging wire and it also appears to be dated to the time period. Is there any sure way to tell if it is original or what it is worth?